Air Screws

By Xah Lee. Date: 2004-09-30

The propeller of a anti-submarine warfare airplane the EP-3E Orion. Note the blade's attack angles are variable, and in this case turned flat.
The propellers of a cargo aircraft
Hercules.
1800×1322
Note the blade's attack angle are variable, and in this case turned very sharp.
A contra-rotating propellers of a modified P-51 Mustang fitted with a Rolls-Royce Griffon. Photo by Eric Gideon.
image source